Andy Street 530ee3eeac Initialize JS executor and context at loadApp time ...

Summary: Automatically starts loading the RN instance as soon as loadApp is called instead of waiting for the UI to be constructed and attached to the window. This saves ~75ms of cold start time on GN 2011 phones.

Also, updates the contract for createReactContextInBackground such that it is only called once (so that people don't accidentally initialize more than once).

See http://imgur.com/a/d7qVm for systrace visualization.

public

Reviewed By: kmagiera

Differential Revision: D2652279

fb-gh-sync-id: 6e7b1fa5dea091af0d568834e11ed23eb1a7860e

2015-11-18 12:40:27 -08:00

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Initialize JS executor and context at loadApp time

2015-11-18 12:40:27 -08:00